METHOD FOR GALVANIC METALLIZATION OF STEEL PARTS Russian patent published in 2019 - IPC C25D3/20 C25D5/36 

FIELD: technological processes.

SUBSTANCE: invention relates to application of galvanic coatings during repair of steel parts in machine building. Method involves anodic roasting and ironing of parts, wherein anode passaging is carried out in electrolyte of following composition, g/l: sulfuric acid 20–30, citric acid 7–10, sulphonic acid 3–5, hydrogen peroxide 1–3, using constant or pulse current of industrial frequency at current density of anode passage from 15 to 90 A/dm² for 20–40 s depending on steel grade, and ironing is carried out on asymmetric alternating current at gradual increase of 5–10 A/dm² per minute ratio of cathode-anode current amplitudes from 1.3 to 8–10 with values of cathode current pulses from 20 to 100 A/dm² from electrolyte containing, g/l: iron dichloride FeCl₂·4H₂O 380–420, sulfuric acid H₂SO₄ 0.8–10 ml/l, potassium iodide 3–5, hydrochloric acid to pH 0.8–1.0, tetraethylammonium hydrochloride 3–4, hexamethylene diamine-Ń,Ń,N,N-tetraacetic acid 0.5–3.0 and polymethylene-β-sulphonate 0.01–0.02.

EFFECT: deposition of iron coatings having a fine-grained structure and firmly bonded with the base of steel parts and cast iron, which enables to use them when restoring worn parts within wear limits up to ½ mm of increased thickness.

1 cl, 1 tbl